Understanding the Purpose of Black Diamond Symbols on Measuring Tapes

The reason behind the 19.2-inch spacing comes from a common construction guideline based on an eight-foot section. Eight feet equals 96 inches, and when this length is divided into five equal parts, the result is 19.2 inches. By placing supports at these intervals, builders can fit five evenly spaced joists or trusses across a typical eight-foot span.continue reading …